Terminal, base station, and communication method

ABSTRACT

A terminal with which it is possible to appropriately transmit uplink control information. In a terminal ( 200 ), a reception unit ( 202 ) receives first control information relating to an uplink data channel, and a second control information relating to an uplink control channel for transmitting uplink control information. The first control information includes first indication information indicating the presence or absence of an uplink data transmission and second indication information indicating the presence or absence a channel state information transmission. A transmission unit ( 220 ) transmits uplink control information using the resource of the uplink data channel when the first indication information indicates that there is no uplink data transmission and the second indication information indicates that there is no channel state information transmission.

TECHNICAL FIELD

The present disclosure relates to a terminal, a base station, and acommunication method.

BACKGROUND ART

New Radio access technology (NR) has been developed for implementing the5th Generation mobile communication systems (5G) in the 3rd GenerationPartnership Project (3GPP). Functions to support Ultra Reliable and LowLatency Communication (URLLC) as well as high-speed and large capacitycommunication, which are basic requirements for enhanced MobileBroadband (eMBB), are main targets under study in NR (e.g., seeNon-Patent Literatures (hereinafter, referred to as “NPL”) 1 to 4).

In NR, a terminal (e.g., referred to as User Equipment (UE)) transmitsUplink Control Information (UCI) to a base station (e.g., eNB: referredto as eNodeB or gNB). The UCI includes, for example, a response signalindicating an error detection result for downlink data(Acknowledgement/Negative Acknowledgement (ACK/NACK)), Channel StateInformation (CSI) for downlink, or a radio resource allocation request(Scheduling Request (SR)) for uplink.

CITATION LIST Non-Patent Literature

-   NPL 1-   3GPP TS 38.211 V15.2.0, “NR; Physical channels and modulation    (Release 15),” June 2018.-   NPL 2-   3GPP TS 38.212 V15.2.0, “NR; Multiplexing and channel coding    (Release 15),” June 2018.-   NPL 3-   3GPP TS 38.213 V15.2.0, “NR; Physical layer procedures for control    (Release 15),” June 2018.-   NPL 4-   3GPP TS 38.214 V15.2.0, “NR; Physical layer procedures for data    (Release 15),” June 2018.

SUMMARY OF INVENTION

However, transmission methods for the uplink control information in NRhave not been fully studied.

One non-limiting and exemplary embodiment facilitates providing aterminal, a base station, and a communication method each capable ofappropriately transmitting uplink control information.

A terminal according to an embodiment of the present disclosureincludes: a receiver, which in operation, receives first controlinformation related to an uplink data channel and second controlinformation related to an uplink control channel for transmitting uplinkcontrol information, wherein the first control information includesfirst indication information indicating presence or absence oftransmission of uplink data and second indication information indicatingpresence or absence of transmission of channel state information; and atransmitter, which in operation, transmits the uplink controlinformation using a resource for the uplink data channel, when the firstindication information indicates the absence of the transmission of theuplink data and the second indication information indicates the absenceof the transmission of the channel state information.

A base station according to an embodiment of the present disclosureincludes: a transmitter, which in operation, transmits first controlinformation related to an uplink data channel and second controlinformation related to an uplink control channel for transmitting uplinkcontrol information, wherein the first control information includesfirst indication information indicating presence or absence oftransmission of uplink data and second indication information indicatingpresence or absence of transmission of channel state information; and areceiver, which in operation, receives the uplink control information tobe transmitted using a resource for the uplink data channel, when thefirst indication information indicates the absence of the transmissionof the uplink data and the second indication information indicates theabsence of the transmission of the channel state information.

A communication method according to an embodiment of the presentdisclosure includes: receiving first control information related to anuplink data channel and second control information related to an uplinkcontrol channel for transmitting uplink control information, wherein thefirst control information includes first indication informationindicating presence or absence of transmission of uplink data and secondindication information indicating presence or absence of transmission ofchannel state information; and transmitting the uplink controlinformation using a resource for the uplink data channel, when the firstindication information indicates the absence of the transmission of theuplink data and the second indication information indicates the absenceof the transmission of the channel state information.

A communication method according to an embodiment of the presentdisclosure includes: transmitting first control information related toan uplink data channel and second control information related to anuplink control channel for transmitting uplink control information,wherein the first control information includes first indicationinformation indicating presence or absence of transmission of uplinkdata and second indication information indicating presence or absence oftransmission of channel state information; and receiving the uplinkcontrol information to be transmitted using a resource for the uplinkdata channel, when the first indication information indicates theabsence of the transmission of the uplink data and the second indicationinformation indicates the absence of the transmission of the channelstate information.

It should be noted that general or specific embodiments may beimplemented as a system, an apparatus, a method, an integrated circuit,a computer program, a storage medium, or any selective combinationthereof.

According to an embodiment of the present disclosure, it is possible toappropriately transmit uplink control information.

Additional benefits and advantages of the disclosed embodiments willbecome apparent from the specification and drawings. The benefits and/oradvantages may be individually obtained by the various embodiments andfeatures of the specification and drawings, which need not all beprovided in order to obtain one or more of such benefits and/oradvantages.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates an exemplary slot configuration in NR;

FIG. 2 illustrates an exemplary UCI transmission on PUSCH;

FIG. 3 is a block diagram illustrating a configuration of a part of abase station according to Embodiment 1;

FIG. 4 is a block diagram illustrating a configuration of a part of aterminal according to Embodiment 1;

FIG. 5 is a block diagram illustrating a configuration of the basestation according to Embodiment 1;

FIG. 6 is a block diagram illustrating a configuration of the terminalaccording to Embodiment 1;

FIG. 7 is a sequence diagram illustrating processing in the base stationand the terminal according to Embodiment 1;

FIG. 8 illustrates an exemplary transmission of ACK/NACK according toEmbodiment 1;

FIG. 9 illustrates an exemplary transmission of CSI according toEmbodiment 1;

FIG. 10 illustrates an exemplary transmission of ACK/NACK and CSIaccording to Embodiment 1;

FIG. 11 illustrates an exemplary transmission of UCI according to avariation of Embodiment 1;

FIG. 12 illustrates another exemplary transmission of UCI according tothe variation of Embodiment 1;

FIG. 13 illustrates an exemplary UCI transmission on PUSCH;

FIG. 14 illustrates another exemplary UCI transmission on PUSCH;

FIG. 15 illustrates an exemplary UCI transmission according toEmbodiment 2;

FIG. 16 illustrates an exemplary UCI transmission on PUSCH;

FIG. 17 illustrates another exemplary UCI transmission on PUSCH;

FIG. 18 illustrates still another exemplary UCI transmission on PUSCH;

FIG. 19 illustrates an exemplary UCI transmission according toEmbodiment 3; and

FIG. 20 illustrates another exemplary UCI transmission according toEmbodiment 3;

DESCRIPTION OF EMBODIMENTS

Hereinafter, detailed descriptions will be given of embodiments of thepresent disclosure with reference to the accompanying drawings.

In NR, a base station performs communication by allocating a radioresource for a terminal in a time unit called a slot or a mini-slot.FIG. 1 illustrates an exemplary slot configuration in NR. A single slotincludes a plurality of Orthogonal Frequency Division Multiplexing(OFDM) symbols. For example, a single slot includes 14 OFDM symbols inNR. In addition, the base station allocates a radio resource for theterminal in a time unit shorter than a slot (e.g., 1, 2, 4, or 7symbols) in a resource allocation of mini-slot units.

The base station also allocates a radio resource in frequency domain forthe terminal in NR. The minimum resource unit in the frequency domain isa Resource Element (RE), and the RE includes a single sub-carrier. Thebase station allocates the radio resource in the frequency domain forthe terminal using a frequency unit called a Resource Block (RB). Asingle RB includes 12 sub-carriers in NR, for example.

When the terminal transmits UCI in a slot (or a mini-slot) where a radioresource for an uplink data channel (e.g., Physical Uplink SharedChannel (PUSCH)), which is hereinafter referred to as a “PUSCHresource”, is not allocated, the terminal transmits the UCI to the basestation using an uplink control channel (e.g., Physical Uplink ControlChannel (PUCCH)).

Note that the UCI to be transmitted using PUCCH includes ACK/NACKindicating an error detection result for downlink data, Periodic CSI(P-CSI), Semi-Persistent CSI (SP-CSI), or SR, for example.

Further, in NR, the base station allocates the PUSCH resource for theterminal using Downlink Control Information (DCI). The DCI forallocating the PUSCH resource (a DCI format used for scheduling PUSCH)includes, for example, DCI format 0-1 (see NPL 2, for example).

The DCI format 0-1 includes a UL-SCH indicator field. When UL-SCHindicator=1 is indicated, for example, uplink data (Uplink SharedChannel (UL-SCH)) is transmitted using PUSCH. When UL-SCH indicator=0 isindicated, in contrast, UL-SCH is not transmitted on PUSCH. That is, theUL-SCH indicator is indication information indicating the presence orabsence of the UL-SCH transmission on PUSCH.

Additionally, the DCI format 0-1 includes a CSI request field. The CSIrequest field is used for requesting CSI transmission using PUSCH fromthe base station to the terminal. Note that the CSI to be transmittedusing PUSCH by the request from the CSI request field includes SP-CSI,or Aperiodic CSI (A-CSI). When non-zero is indicated in the CSI requestfield, for example, CSI is transmitted using PUSCH. When zero isindicated in the CSI request field, in contrast, the base station doesnot request a CSI report in the corresponding PUSCH to the terminal.That is, the CSI request is indication information indicating thepresence or absence of the CSI transmission on PUSCH.

The CSI report on PUSCH can be transmitted by being multiplexed withUL-SCH on PUSCH. At this time, UL-SCH indicator=1 and CSIrequest=non-zero are indicated to the terminal by DCI.

The CSI report on PUSCH can be transmitted without the UL-SCHtransmission on PUSCH. At this time, UL-SCH indicator=0 and CSIrequest=non-zero are indicated to the terminal by DCI.

Further, the terminal can transmit UL-SCH on PUSCH when the base stationdoes not request the CSI report. At this time, UL-SCH indicator=1 andCSI request=0 are indicated to the terminal by DCI.

As described above, the terminal transmits UCI and UL-SCH to the basestation based on the relationship between the respective configurationsof the UL-SCH indicator field and the CSI request field by DCI. Theabove-described relationships between the UL-SCH indicator field and theCSI request field is not complete, however.

Operations of the terminal are unclear when UL-SCH indicator=0 and CSIrequest=0 are indicated in DCI, that is, when the UL-SCH transmission onPUSCH does not occur and the base station does not request the CSIreport, for example.

This may cause the following problem as an example.

The terminal indicated UL-SCH indicator=0 and CSI request=0 cannottransmit UCI on PUSCH, for example. FIG. 2 illustrates a case where aPUSCH resource indicated UL-SCH indicator=0 and CSI request=0 isallocated to the same time resource as (or a time resource partlyoverlapped with) a slot (or a mini-slot) to which PUCCH for transmittingUCI such as ACK/NACK to downlink data (e.g., PDSCH) is allocated, forexample. In the case of FIG. 2, the terminal conceivably transmits theUCI (e.g., ACK/NACK) not on PUSCH but on PUCCH.

The allocation of a radio resource for PUCCH (hereinafter referred to asa “PUCCH resource”), however, is operated semi-statically. Thesemi-static allocation of the PUCCH resource cannot follow a dynamicchange of a channel state or a requirement, and thus the radio resourcemay not be used effectively. For example, when the channel state of thesemi-statically allocated PUCCH resource is deteriorated by theinfluence of channel fluctuation or inter-cell interference, the UCItransmission on PUCCH by the terminal may cause the received quality ofthe UCI to be deteriorated. The deterioration of the received quality ofthe UCI possibly causes influence on system optimization and causesdeterioration of system throughput.

Thus, an embodiment of the present disclosure will describe methods ofappropriately transmitting UCI from a terminal to a base station in NR.

Hereinafter, each embodiment will be described in detail.

Embodiment 1

[Overview of Communication System]

The communication system according to each embodiment of the presentdisclosure includes base station 100 and terminal 200.

FIG. 3 is a block diagram illustrating a configuration of a part of basestation 100 according to each embodiment of the present disclosure. Inbase station 100 illustrated in FIG. 3, transmitter 114 transmits thefirst control information (e.g., DCI) on an uplink data channel (e.g.,PUSCH) and the second control information on an uplink control channel(e.g., PUCCH) for transmitting uplink control information (e.g., UCI).The first control information includes the first indication information(e.g., a UL-SCH indicator) indicating the presence or absence oftransmission of uplink data (e.g., UL-SCH) and the second indicationinformation (e.g., a CSI request) indicating the presence or absence oftransmission of channel state information (CSI). Receiver 116 receivesthe uplink control information to be transmitted using a resource forthe uplink data channel when the first indication information indicatesthe absence of the transmission of the uplink data and the secondindication information indicates the absence of the transmission of thechannel state information.

FIG. 4 is a block diagram illustrating a configuration of a part ofterminal 200 according to each embodiment of the present disclosure. Interminal 200 illustrated in FIG. 4, receiver 202 receives the firstcontrol information (e.g., DCI) on an uplink data channel (e.g., PUSCH)and the second control information on an uplink control channel (e.g.,PUCCH) for transmitting uplink control information (e.g., UCI). Thefirst control information includes the first indication information(e.g., a UL-SCH indicator) indicating the presence or absence oftransmission of uplink data and the second indication information (e.g.,a CSI request) indicating the presence or absence of transmission ofchannel state information. Transmitter 220 transmits the uplink controlinformation using a resource for the uplink data channel when the firstindication information indicates the absence of the transmission of theuplink data and the second indication information indicates the absenceof the transmission of the channel state information.

[Configuration of Base Station]

FIG. 5 is a block diagram illustrating a configuration of base station100 according to Embodiment 1 of the present disclosure. In FIG. 5, basestation 100 includes controller 101, data generator 102, encoder 103,retransmission controller 104, modulator 105, higher-layer controlsignal generator 106, encoder 107, modulator 108, downlink controlsignal generator 109, encoder 110, modulator 111, signal assigner 112,Inverse Fast Fourier Transformer (hereinafter, referred to as “IFFT”)113, transmitter 114, antenna 115, receiver 116, Fast FourierTransformer (hereinafter, referred to as “FFT”) 117, extractor 118,ACK/NACK demodulator 119, decoder 120, determiner 121, CSI demodulator122, decoder 123, determiner 124, UL-SCH demodulator 125, decoder 126,and determiner 127.

Controller 101 determines information on uplink transmission of terminal200, and outputs the determined information to extractor 118.

The information on uplink transmission of terminal 200 includes, forexample, information on a PUSCH resource or information on UCItransmission. The information on the PUSCH resource includes thepresence or absence of UL-SCH (e.g., the UL-SCH indicator), the presenceor absence of A/SP-CSI request (e.g., the CSI request), a Modulation andCoding scheme (MCS) for the information to be transmitted on PUSCH(e.g., UL-SCH or UCI), and radio resource allocation for PUSCH, forexample. The information on UCI transmission includes MCS for theinformation to be transmitted on PUCCH (UCI), and information on thePUCCH resource.

In addition, controller 101 determines a resource for transmitting UCIin terminal 200, and outputs the determined information to extractor118. For example, controller 101 determines the resource fortransmitting UCI in terminal 200 based on the information on the PUCCHresource, the information on the PUSCH resource (e.g., information ofthe UL-SCH indicator and the CSI request), or the positionalrelationship between the PUCCH resource and the PUSCH resource in timedomain. Note that determination methods for the resource fortransmitting UCI in terminal 200 will be described later in detail.

Controller 101 also outputs the information on the uplink transmissionof terminal 200 to higher-layer control signal generator 106 or downlinkcontrol signal generator 109.

The information to be outputted to higher-layer control signal generator106 includes information on PUCCH transmission to be semi-staticallyallocated or the information on the PUCCH resource, for example.

Meanwhile, the information to be outputted to downlink control signalgenerator 109 includes the presence or absence of UL-SCH (e.g., theUL-SCH indicator) to be indicated by DCI (e.g., DCI format 0-1) forallocating the PUSCH resource, the presence or absence of A/SP-CSIrequest (e.g., the CSI request), MCS for the information to betransmitted on PUSCH, and resource allocation, for example. Theinformation to be outputted to downlink control signal generator 109also includes information on the PUCCH resource to transmit ACK/NACK tobe indicated by DCI (e.g., DCI format 1-0 or DCI format 1-1) forallocating a radio resource for PDSCH (hereinafter referred to as a“PDSCH resource”).

In addition, controller 101 determines the radio resource allocation fora higher-layer control signal or a downlink control signal fortransmitting downlink control information, and the radio resourceallocation for a downlink data signal. Controller 101 outputs thedetermined information to signal assigner 112.

Data generator 102 generates downlink data for terminal 200, and outputsthe data to encoder 103.

Encoder 103 applies error correction encoding to the downlink data to beinputted from data generator 102, and outputs the data signal afterencoding to retransmission controller 104.

Retransmission controller 104 holds the encoded data signal to beinputted from encoder 103 at the first transmission, and also outputsthe signal to modulator 105. Further, when NACK to the transmitted datasignal is inputted from determiner 121, which will be described later,retransmission controller 104 outputs the corresponding holding data tomodulator 105. When ACK to the transmitted data signal is inputted fromdeterminer 121, in contrast, retransmission controller 104 deletes thecorresponding holding data.

Modulator 105 modulates the data signal to be inputted fromretransmission controller 104, and outputs the data modulated signal tosignal assigner 112.

Higher-layer control signal generator 106 generates a controlinformation bit string (a higher-layer control signal) using the controlinformation to be inputted from controller 101, and outputs thegenerated control information bit string to encoder 107.

Encoder 107 applies error correction encoding to the control informationbit string to be inputted from higher-layer control signal generator 106and outputs the control signal after encoding to modulator 108.

Modulator 108 modulates the control signal to be inputted from encoder107, and outputs the control signal after the modulation to signalassigner 112.

Downlink control signal generator 109 generates a control informationbit string (a downlink control signal; e.g., DCI) using the controlinformation to be inputted from controller 101, and outputs thegenerated control information bit string to encoder 110. The controlinformation is transmitted to a plurality of terminals in some cases,and thus downlink control signal generator 109 may generate the bitstring including a terminal ID of each terminal in the controlinformation for each terminal.

Encoder 110 applies error correction encoding to the control informationbit string to be inputted from downlink control signal generator 109,and outputs the control signal after encoding to modulator 111.

Modulator 111 modulates the control signal to be inputted from encoder110, and outputs the control signal after the modulation to signalassigner 112.

Signal assigner 112 maps the data signal to be inputted from modulator105, the higher-layer control signal to be inputted from modulator 108,or the downlink control signal to be inputted from modulator 111 to aradio resource based on the information indicating the radio resource tobe inputted from controller 101. Signal assigner 112 outputs thedownlink signal including the mapped signal to IFFT 113.

IFFT 113 applies transmission waveform generation processing such asOFDM to the signal to be inputted from signal assigner 112. IFFT 113adds a Cyclic Prefix (CP) in the case of OFDM transmission adding a CP(not illustrated). IFFT 113 outputs the generated transmission waveformto transmitter 114.

Transmitter 114 applies Radio Frequency (RF) processing such asDigital-to-Analog (D/A) conversion and up-conversion to the signal to beinputted from IFFT 113, and transmits the radio signal to terminal 200via antenna 115.

Receiver 116 applies RF processing such as down-conversion orAnalog-to-Digital (A/D) conversion to an uplink signal waveform receivedfrom terminal 200 via antenna 115, and outputs the uplink signalwaveform after the reception processing to FFT 117.

FFT 117 applies FFT processing for converting a time-domain signal intoa frequency-domain signal to the uplink signal waveform to be inputtedfrom receiver 116. FFT 117 outputs the frequency-domain signal obtainedby the FFT processing to extractor 118.

Extractor 118 extracts a radio resource component on which ACK/NACK hasbeen transmitted, a radio resource component on which CSI has beentransmitted, or a radio resource component on which UL-SCH has beentransmitted, from the signal to be inputted from FFT 117 based on theinformation to be inputted from controller 101 (e.g., the information onthe uplink transmission). Extractor 118 outputs the extracted radioresource component of ACK/NACK to ACK/NACK demodulator 119, outputs theextracted radio resource component of CSI to CSI demodulator 122, andoutputs the extracted radio resource component of UL-SCH to UL-SCHdemodulator 125.

ACK/NACK demodulator 119 equalizes and demodulates the radio resourcecomponent corresponding to ACK/NACK to be inputted from extractor 118,and outputs the demodulation result to decoder 120.

Decoder 120 performs error correction decoding on the signalcorresponding to ACK/NACK using the demodulation result to be inputtedfrom ACK/NACK demodulator 119, and outputs the bit sequence afterdecoding to determiner 121.

Determiner 121 determines whether the ACK/NACK transmitted from terminal200 indicates ACK or NACK to the transmitted data signal based on thebit sequence to be inputted from decoder 120. Determiner 121 outputs thedetermination result to retransmission controller 104.

CSI demodulator 122 equalizes and demodulates the radio resourcecomponent corresponding to CSI to be inputted from extractor 118, andoutputs the demodulation result to decoder 123.

Decoder 123 performs error correction decoding on the signalcorresponding to CSI using the demodulation result to be inputted fromCSI demodulator 122, and outputs the bit sequence after decoding todeterminer 124.

Determiner 124 applies error detection to the bit sequence to beinputted from decoder 123, and obtains received CSI when no error isdetected.

UL-SCH demodulator 125 equalizes and demodulates the radio resourcecomponent corresponding to UL-SCH to be inputted from extractor 118, andoutputs the demodulation result to decoder 126.

Decoder 126 performs error correction decoding on the signalcorresponding to UL-SCH using the demodulation result to be inputtedfrom UL-SCH demodulator 125, and outputs the bit sequence after decodingto determiner 127.

Determiner 127 applies error detection to the bit sequence to beinputted from decoder 126, and obtains received data (i.e., receivedUL-SCH) when no error is detected. Note that determiner 127 may generateACK/NACK for a retransmission request to terminal 200 using the errordetection result, and output the signal to retransmission controller 104(not illustrated).

[Configuration of Terminal]

FIG. 6 is a block diagram illustrating a configuration of terminal 200according to Embodiment 1 of the present disclosure. In FIG. 6, terminal200 includes antenna 201, receiver 202, FFT 203, extractor 204, downlinkcontrol signal demodulator 205, decoder 206, higher-layer control signaldemodulator 207, decoder 208, data demodulator 209, decoder 210,controller 211, encoders 212, 214, and 216, modulators 213, 215, and217, signal assigner 218, IFFT 219, and transmitter 220.

Receiver 202 applies RF processing such as down-conversion orAnalog-to-Digital (A/D) conversion to a signal waveform of a downlinksignal (a data signal or a control signal) received from base station100 via antenna 201, and outputs the received signal (i.e., a basebandsignal) obtained by the RF processing to FFT 203.

FFT 203 applies FFT processing for converting a time-domain signal intoa frequency-domain signal to the signal (the time-domain signal) to beinputted from receiver 202. FFT 203 outputs the frequency-domain signalobtained by the FFT processing to extractor 204.

Extractor 204 extracts a downlink control signal (e.g., DCI) from thesignal to be inputted from FFT 203 based on the control information tobe inputted from controller 211, and outputs the signal to downlinkcontrol signal demodulator 205. Extractor 204 also extracts ahigher-layer control signal and a downlink data signal based on thecontrol information to be inputted from controller 211. Extractor 204outputs the higher-layer control signal to higher-layer control signaldemodulator 207, and the downlink data signal to data demodulator 209.

Downlink control signal demodulator 205 blind-decodes the downlinkcontrol signal to be inputted from extractor 204. When the signal isdetermined to be a control signal for terminal 200, downlink controlsignal demodulator 205 demodulates the control signal and outputs thedemodulation result to decoder 206.

Decoder 206 applies error correction decoding using the demodulationresult to be inputted from downlink control signal demodulator 205, andobtains control information. Decoder 206 then outputs the obtainedcontrol information to controller 211.

Higher-layer control signal demodulator 207 equalizes and demodulatesthe higher-layer control signal to be inputted from extractor 204, andoutputs the demodulation result to decoder 208.

Decoder 208 applies error correction decoding using the demodulationresult to be inputted from higher-layer control signal demodulator 207,and obtains control information. Decoder 208 then outputs the obtainedcontrol information to controller 211.

Data demodulator 209 equalizes and demodulates the downlink data signalto be inputted from extractor 204, and outputs the demodulation resultto decoder 210.

Decoder 210 applies error correction decoding using the demodulationresult to be inputted from data demodulator 209. Decoder 210 alsoapplies error detection to the downlink data signal, and outputs theerror detection result to controller 211. In addition, decoder 210outputs the downlink data determined to have no errors as a result ofthe error detection, as received data.

Controller 211 calculates, for example, MCS to be used for the uplinktransmission or radio resource allocation based on the information onthe uplink transmission of terminal 200 included in the controlinformation to be inputted from decoder 206 or decoder 208. Controller211 outputs the calculated information to encoders 212, 214, and 216,modulators 213, 215, and 217, and signal assigner 218 respectively.Controller 211 also generates ACK/NACK using the error detection resultto be inputted from decoder 210, and outputs the ACK/NACK to encoder212.

Further, controller 211 determines a resource for terminal 200 totransmit UCI (e.g., ACK/NACK or CSI) based on the information on thePUCCH resource, the information on the PUSCH resource (e.g., theinformation of the UL-SCH indicator and the CSI request), or thepositional relationship between the PUCCH resource and the PUSCHresource in time domain. Controller 211 outputs information indicatingthe determined resource to signal assigner 218.

Furthermore, controller 211 outputs the information on the radioresource for the downlink data signal or the control signal included inthe control information to be inputted from decoder 206 or decoder 208,to extractor 204.

Encoder 212 applies error correction encoding to the ACK/NACK (a bitsequence) to be inputted from controller 211, and outputs the ACK/NACK(the bit sequence) after encoding to modulator 213.

Modulator 213 modulates the ACK/NACK to be inputted from encoder 212,and outputs the ACK/NACK after the modulation (a modulation symbolsequence) to signal assigner 218.

Encoder 214 applies error correction encoding to a bit sequencecorresponding to CSI to be inputted, and outputs the CSI (the bitsequence) after encoding to modulator 215.

Modulator 215 modulates the CSI to be inputted from encoder 214, andoutputs the CSI after the modulation (a modulation symbol sequence) tosignal assigner 218.

Encoder 216 applies error correction encoding to the uplink data(UL-SCH) to be inputted, and outputs the uplink data (the bit sequence)after encoding to modulator 217.

Modulator 217 modulates the uplink data to be inputted from encoder 216,and outputs the uplink data after the modulation (a modulation symbolsequence) to signal assigner 218.

Note that encoders 212, 214, and 216, and modulators 213, 215, and 217respectively perform the encoding process and the demodulation processbased on the control information inputted from controller 211 (e.g., acoding rate or a modulation scheme).

Signal assigner 218 respectively maps the ACK/NACK to be inputted frommodulator 213, the CSI to be inputted from modulator 215, or the uplinkdata to be inputted from modulator 217 to the radio resource to beindicated by controller 211. Signal assigner 218 outputs the uplinksignal including the mapped signal to IFFT 219.

IFFT 219 applies transmission waveform generation processing such asOFDM to the signal to be inputted from signal assigner 218. IFFT 219adds a Cyclic Prefix (CP) in the case of OFDM transmission adding a CP(not illustrated). Alternatively, a Discrete Fourier Transformer (DFT)may be added in a preceding stage of signal assigner 218 when IFFT 219generates a single-carrier waveform (not illustrated). IFFT 219 outputsthe generated transmission waveform to transmitter 220.

Transmitter 220 applies Radio Frequency (RF) processing such asDigital-to-Analog (D/A) conversion and up-conversion to the signal to beinputted from IFFT 219, and transmits the radio signal to base station100 via antenna 201.

[Operations of Base Station 100 and Terminal 200]

Operations of base station 100 and terminal 200 that includeabove-mentioned configurations will be described in detail.

FIG. 7 illustrates the processing in base station 100 and terminal 200according to the present embodiment.

Base station 100 transmits information on PUCCH to be configuredsemi-statically (e.g., information on PUCCH transmission or informationon a PUCCH resource) to terminal 200 (ST101). Terminal 200 acquires theinformation on PUCCH indicated from base station 100 (ST102).

Base station 100 transmits DCI including information on downlink dataand downlink data corresponding to the DCI to terminal 200 (ST103).Terminal 200 acquires the information on the PUCCH resource fortransmitting ACK/NACK, for example, based on the DCI to be indicatedfrom base station 100 (ST104). Terminal 200 also acquires the downlinkdata (PDSCH) based on information on a PDSCH resource included in theDCI (ST105).

Base station 100 transmits control information (e.g., DCI) includinginformation on PUSCH (e.g., a UL-SCH indicator, a CSI request, orresource allocation information) to terminal 200 (ST106). Terminal 200acquires the information on PUSCH to be indicated from base station 100(ST107).

Terminal 200 controls the operation related to UCI transmission (ST108).For example, terminal 200 determines a resource (e.g., a PUCCH resourceor a PUSCH resource) for transmitting the UCI based on the informationon PUSCH included in the DCI (e.g., the UL-SCH indicator, the CSIrequest, or the PUSCH resource), and the information on PUCCH to beconfigured semi-statically (e.g., the PUCCH resource). When UL-SCHindicator=0 and CSI request=0 are indicated by the DCI allocating PUSCH,for example, terminal 200 determines the resource to be used for the UCItransmission to be the PUSCH resource allocated by the DCI.

Terminal 200 transmits the UCI to base station 100 using the determinedresource (the PUCCH resource or the PUSCH resource) (ST109). Basestation 100 receives the UCI to be transmitted from terminal 200 usingthe determined resource (ST110).

Note that, in FIG. 7, the order of the processes from ST103 to ST105 andthe processes in ST106 and ST107 may be replaced with each other.

Next, control methods of the operation related to the UCI transmission(e.g., a process in ST108 in FIG. 7) in terminal 200 will be describedin detail.

For example, base station 100 indicates UL-SCH indicator=0 and CSIrequest=0 to terminal 200 using DCI allocating PUSCH.

When a PUSCH resource configured with UL-SCH indicator=0 and CSIrequest=0 is allocated and the PUSCH resource overlaps (or partlyoverlaps) in time with a PUCCH resource allocated for transmitting UCI,terminal 200 transmits the UCI scheduled to be transmitted in the PUCCHresource, using the PUSCH resource.

For example, when base station 100 allocates the PUSCH resourceoverlapping in time with the PUCCH resource for transmitting the UCI,base station 100 may configure UL-SCH indicator=0 and CSI request=0, andindicate DCI allocating the PUSCH resource to terminal 200.

This enables terminal 200 to transmit the UCI for which the PUCCHresource is allocated using the PUSCH resource where neither of UL-SCHnor CSI is transmitted.

Note that the UCI scheduled to be transmitted on PUCCH includes at leastone of ACK/NACK to downlink data and P-CSI/SP-CSI, for example.

Hereinafter, exemplary operations of base station 100 and terminal 200according to information included in UCI will be described in detail.

Example 1: Case where UCI Includes Only ACK/NACK to Downlink Data

When UCI includes only ACK/NACK to downlink data, base station 100allocates a PUCCH resource for transmitting the ACK/NACK to downlinkdata for terminal 200.

The PUCCH resource for transmitting ACK/NACK to downlink data may beindicated semi-statically by UE-specific higher layer signaling, forexample. Alternatively, a PUCCH resource set including a plurality of(e.g., eight of) PUCCH resources (candidates) may be indicated byUE-specific higher layer signaling, and a PUCCH Resource Indicator (PRI)in DCI allocating downlink data (e.g., DCI format 1-0 or DCI format 1-1)may indicate any of the PUCCH resources in the PUCCH resource set as thePUCCH resource for transmitting the ACK/NACK to the downlink data.

Further, when the number of the PUCCH resources in the PUCCH resourceset is more than the number of PUCCH resources explicitly indicatable byPM (e.g., when PRI is 3 bits and the number of the PUCCH resources inthe PUCCH resource set is more than 8), the PUCCH resource may beimplicitly indicated using a Control Chanel Element (CCE) in DCIallocating the downlink data. The CCE and the PUCCH resource may beassociated one-to-one, for example.

Incidentally, base station 100 configures UL-SCH indicator=0 and CSIrequest=0 in the DCI allocating PUSCH (e.g., DCI format 0-1) andallocates the PUSCH resource for terminal 200. For example, base station100 may allocate the PUSCH resource configured with UL-SCH indicator=0and CSI request=0 for terminal 200 so as to overlap in time with thePUCCH resource for transmitting ACK/NACK.

When the PUCCH resource for transmitting ACK/NACK and the PUSCH resourceallocated by the DCI configured with UL-SCH indicator=0 and CSIrequest=0 do not overlap in time with each other, terminal 200 transmitsthe ACK/NACK on PUCCH, for example. Terminal 200 does not transmit theACK/NACK in the PUSCH resource allocated by the DCI.

Meanwhile, the PUCCH resource for transmitting ACK/NACK and the PUSCHresource allocated by the DCI configured with UL-SCH indicator=0 and CSIrequest=0 overlap in time with each other, terminal 200 transmits theACK/NACK using the PUSCH resource, as illustrated in FIG. 8. In otherwords, terminal 200 does not transmit the ACK/NACK in the PUCCH resourceallocated for transmitting the ACK/NACK.

Example 2: Case where UCI Includes Only P-CSI or SP-CSI

When UCI includes only P-CSI or SP-CSI (hereinafter, collectivelyreferred to as “P/SP-CSI”), base station 100 allocates a PUCCH resourcefor transmitting the P/SP-CSI for terminal 200.

The PUCCH resource for transmitting the P/SP-CSI is semi-staticallyindicated to terminal 200 from base station 100 by UE-specific higherlayer signaling, for example.

In addition, base station 100 configures UL-SCH indicator=0 and CSIrequest=0 in the DCI allocating PUSCH (e.g., DCI format 0-1) andallocates the PUSCH resource for terminal 200. For example, base station100 may allocate the PUSCH resource configured with UL-SCH indicator=0and CSI request=0 for terminal 200 so as to overlap in time with thePUCCH resource for transmitting P/SP-CSI.

When the PUCCH resource for transmitting P/SP-CSI and the PUSCH resourceallocated by the DCI configured with UL-SCH indicator=0 and CSIrequest=0 do not overlap in time with each other, terminal 200 transmitsthe P/SP-CSI on PUCCH, for example. Terminal 200 does not transmit theP/SP-CSI in the PUSCH resource.

Meanwhile, the PUCCH resource for transmitting P/SP-CSI and the PUSCHresource allocated by the DCI configured with UL-SCH indicator=0 and CSIrequest=0 overlap in time with each other, terminal 200 transmits theP/SP-CSI using the PUSCH resource, as illustrated in FIG. 9. In otherwords, terminal 200 does not transmit the P/SP-CSI in the PUCCH resourceallocated for transmitting the P/SP-CSI.

Note that the CSI transmitted by terminal 200 using the PUSCH resourcemay be A-CSI in Example 2.

Example 3: Case where UCI Includes ACK/NACK to Downlink Data andP/SP-CSI

When UCI includes ACK/NACK and P/SP-CSI, base station 100 allocates aPUCCH resource for transmitting the ACK/NACK to downlink data and theP/SP-CSI for terminal 200.

The PUCCH resource for transmitting ACK/NACK to downlink data andP/SP-CSI may be indicated semi-statically by UE-specific higher layersignaling, for example. Alternatively, a PUCCH resource set including aplurality of (e.g., eight of) PUCCH resources (candidates) may beindicated by UE-specific higher layer signaling, and PRI in DCIallocating downlink data (e.g., DCI format 1-0 or DCI format 1-1) mayindicate any of the PUCCH resources in the PUCCH resource set as thePUCCH resource for transmitting the ACK/NACK to the downlink data andthe P/SP-CSI.

In addition, base station 100 configures UL-SCH indicator=0 and CSIrequest=0 in the DCI allocating PUSCH (e.g., DCI format 0-1) andallocates the PUSCH resource for terminal 200. For example, base station100 may allocate the PUSCH resource configured with UL-SCH indicator=0and CSI request=0 for terminal 200 so as to overlap in time with thePUCCH resource for transmitting ACK/NACK and P/SP-CSI.

When the PUCCH resource for transmitting ACK/NACK and P/SP-CSI and thePUSCH resource allocated by the DCI configured with UL-SCH indicator=0and CSI request=0 do not overlap in time with each other, terminal 200transmits the ACK/NACK and the P/SP-CSI on PUCCH, for example. Terminal200 does not transmit the ACK/NACK and the P/SP-CSI in the PUSCHresource allocated by the DCI configured with UL-SCH indicator=0 and CSIrequest=0.

Meanwhile, the PUCCH resource for transmitting ACK/NACK and P/SP-CSI andthe PUSCH resource allocated by the DCI configured with UL-SCHindicator=0 and CSI request=0 overlap in time with each other, terminal200 transmits the ACK/NACK and the P/SP-CSI using the PUSCH resource, asillustrated in FIG. 10. In other words, terminal 200 does not transmitthe ACK/NACK and the P/SP-CSI in the PUCCH resource allocated fortransmitting the ACK/NACK and the P/SP-CSI.

The exemplary operations of base station 100 and terminal 200 accordingto information included in UCI have been described, thus far.

As described above, base station 100 allocates a PUSCH resource by DCIconfigured with UL-SCH indicator=0 and CSI request=0 for terminal 200 inthe present embodiment. Further, terminal 200 transmits UCI using thePUSCH resource allocated by the DCI when a PUCCH resource allocated fortransmitting the UCI and the PUSCH resource allocated by the DCIconfigured with UL-SCH indicator=0 and CSI request=0 overlap in timewith each other.

A PUSCH resource is dynamically allocated while a PUCCH resource issemi-statically allocated as described above. Thus, base station 100 candynamically allocate the PUSCH resource for transmitting UCI, forexample, following a change of a channel state between base station 100and terminal 200, or the like. This enables terminal 200 to transmit UCIusing the PUSCH resource allocated according to the channel state evenwhen the channel state of the PUCCH resource is deteriorated due tochannel fluctuation or inter-cell interference, for example.

Therefore, terminal 200 can appropriately transmit UCI according to thepresent embodiment. For example, the received quality of UCI in basestation 100 can be improved and the uplink resource utilizationefficiency can also be improved according to the present embodiment.

Additionally, terminal 200 transmits UCI, which is originally scheduledto be transmitted using a PUCCH resource, using a PUSCH resourceindicated by DCI configured with UL-SCH indicator=0 and CSI request=0,that is, the PUSCH resource transmitting neither of UL-SCH nor CSI. Thisenables base station 100 to appropriately control the operation (e.g.,the transmission of UL-SCH or UCI) of terminal 200 according to therelationship between the UL-SCH indicator and the CSI request indicatedin DCI.

Variation 1 of Embodiment 1

Once transmission of P/SP-CSI is semi-statically requested from basestation 100 to terminal 200, terminal 200 continues to transmit P/SP-CSIperiodically or semi-persistently until the next semi-static indicationopportunity. Thus, base station 100 cannot dynamically control theP/SP-CSI transmission from terminal 200. It is possible, however, thatbase station 100 does not need the P/SP-CSI transmitted from terminal200.

Then, in the variation of Embodiment 1, terminal 200 drops the P/SP-CSItransmission when UL-SCH indicator=0 and CSI request=0 are indicated inDCI, as illustrated in FIG. 11, in a case where UCI includes at leastP/SP-CSI. In other words, terminal 200 does not perform transmission ina PUCCH resource and a PUSCH resource when the PUCCH resource fortransmitting P/SP-CSI and the PUSCH resource overlap in time with eachother, as illustrated in FIG. 11.

Note that the operation in FIG. 11 can be similarly applied to a casewhere UCI includes ACK/NACK and P/SP-CSI as illustrated in FIG. 9, forexample, although FIG. 11 illustrates an example of a case where UCIincludes only P/SP-CSI as illustrated in FIG. 8. For example, terminal200 may drop the P/SP-CSI transmission when UL-SCH indicator=0 and CSIrequest=0 are indicated in DCI, as illustrated in FIG. 12. In otherwords, terminal 200 drops the P/SP-CSI transmission and transmitsACK/NACK using the PUSCH resource, as illustrated in FIG. 12.

This enables to temporarily stop the P/SP-CSI transmission in terminal200 and improve the uplink resource utilization efficiency. In addition,dropping the P/SP-CSI transmission when UCI includes ACK/NACK andP/SP-CSI increases the resource to be allocated for ACK/NACK, therebyimproving the received quality of ACK/NACK.

Embodiment 2

Descriptions will be given of a case where Carrier aggregation (CA) isapplied to a terminal in the present embodiment.

A base station and a terminal according to the present embodiment havethe same basic configurations as base station 100 and terminal 200according to Embodiment 1, and thus FIGS. 5 and 6 will be used for thedescription.

In the case of CA, base station 100 can configure a plurality ofComponent Carriers (CCs; may be referred to as “carriers” or “cells”)for terminal 200, and allocate PUSCH in each of the CCs.

Herein, terminal 200 multiplexes UCI on PUSCH in CC with the smallest CCindex (or the CC number, e.g., ServCellIndex) among the plurality of CCswhen PUCCH resources for transmitting UCI in the plurality of CCsoverlap in time with each other (see, for example, NPL 3).

In addition, terminal 200 multiplexes UCI on PUSCH for whichtransmission starts earliest in time (i.e., PUSCH with the smallestsymbol index for starting the PUSCH transmission) regardless of CA ornon-CA, when a plurality of PUSCHs are allocated for a single CC, and aPUCCH resource transmitting UCI and the plurality of PUSCHs overlap intime with each other (see, for example, NPL 3).

Further, when PUSCH is allocated for each of a plurality of CCs, or whena plurality of PUSCHs are allocated for a single CC, DCI for allocatingeach PUSCH is configured with a UL-SCH indicator field and a CSI requestfield.

However, the relationship between the configurations of the UL-SCHindicator field and the CSI request field in the plurality of CCs andthe operation in terminal 200 is unclear.

This may cause the following problems as examples.

It is assumed that a PUSCH resource is allocated as illustrated in FIG.13. The PUSCH resource is configured with UL-SCH indicator=1 and CSIrequest=0 in CC index 0 (CC #0), and with UL-SCH indicator=0 and CSIrequest=0 in CC index 1 (CC #1), for example.

In this case, UCI is multiplexed on PUSCH in CC #0 (CC with the smallestCC index) when a PUCCH resource for transmitting the UCI and the PUSCHresource overlap in time with each other, according to theabove-described multiplexing method for UCI in a plurality of CCs. Thus,terminal 200 cannot use PUSCH in CC #1 in FIG. 13 even though PUSCH isallocated in CC #1. In addition, a part of the PUSCH resource in CC #0is used for the UCI transmission when terminal 200 transmits UL-SCHusing the PUSCH in CC #0 (i.e., the case of UL-SCH indicator=1) asillustrated in FIG. 13. This causes a risk of deteriorating the receivedquality of the UL-SCH.

Herein, it is conceivable, for example, to configure UL-SCH indicator=0in CC #0 and UL-SCH indicator=1 in CC #1 as illustrated in FIG. 14, as amethod of preventing the deterioration of the received quality of UL-SCHdescribed in FIG. 13. In the case of FIG. 14, terminal 200 can transmitUL-SCH using the PUSCH resource in CC #1 without UCI being multiplexed.

However, PUSCH configured with UL-SCH indicator=0 and CSI request=0 isallocated in CC #0 as illustrated in FIG. 14, and terminal 200 cannottransmit UCI in the PUSCH. Terminal 200 thus transmits the UCI on PUCCHin CC #0 (i.e., a resource semi-statically operated) in FIG. 14.Terminal 200, however, cannot follow a dynamic change of a channel stateor a requirement in this case, and the received quality of the UCI ispossibly deteriorated accordingly.

In this regard, terminal 200 transmits UCI scheduled to be transmittedon PUCCH using a PUSCH resource in the present embodiment when theUL-SCH field and the CSI request field are configured for each of theplurality of CCs, a PUSCH resource configured with CSI request=0 isallocated for all the CCs, and the allocated PUSCH resource and a PUCCHresource allocated for transmitting UCI overlap (or partly overlap) intime with each other, as illustrated in FIG. 15.

Herein, the UCI scheduled to be transmitted on PUCCH includes, forexample, at least either one of ACK/NACK to downlink data andP-CSI/SP-CSI.

Further, terminal 200 multiplexes the UCI on PUSCH in the CC configuredwith UL-SCH indicator=0 (CC #1 in FIG. 15) among the plurality of CCsconfigured for terminal 200, as illustrated in FIG. 15. In other words,terminal 200 transmits the UCI using a PUSCH resource to be allocated byDCI configured with UL-SCH indicator=0 and CSI request=0, as inEmbodiment 1.

In FIG. 15, terminal 200 transmits UL-SCH (uplink data) using the PUSCHresource in CC #0 configured with UL-SCH indicator=1 and CSI request=0,and transmits UCI (at least either of ACK/NACK and P/SP-CSI) using thePUSCH resource in CC #1 configured with UL-SCH indicator=0 and CSIrequest=0.

As described above, the present embodiment enables to avoid themultiplex of UCI on PUSCH where terminal 200 transmits UL-SCH (the PUSCHresource in CC #0 in FIG. 15), thereby preventing the deterioration ofthe received quality of the UL-SCH. The present embodiment also enablesbase station 100 to dynamically allocate the PUSCH resource fortransmitting UCI (the PUSCH resource in CC #1 in FIG. 15) following, forexample, a change of a channel state, as is the case with Embodiment 1.Therefore, the received quality of UCI in base station 100 and theuplink resource utilization efficiency can be improved.

When UL-SCH indicator=0 is configured for a plurality of CCs, terminal200 may multiplex UCI on PUSCH in CC with the smallest CC index amongthe plurality of CCs configured with UL-SCH indicator=0, for example.Note that CC for which the PUSCH resource to be used for the UCItransmission is allocated is not limited to the CC with the smallest CCindex, and may be another CC.

In addition, when UL-SCH indicator=1 is configured for all of theplurality of CCs, terminal 200 may multiplex UCI on PUSCH transmitted inCC with the smallest CC index as with the method described in NPL 3, forexample. Note that CC for which the PUSCH resource to be used for theUCI transmission is allocated is not limited to the CC with the smallestCC index, and may be another CC.

Further, when a plurality of PUSCHs are allocated in a single CC and aPUCCH resource for transmitting UCI and the plurality of PUSCHs overlapin time with each other, terminal 200 may multiplex the UCI on PUSCH forwhich transmission starts earliest in time (i.e., PUSCH with a smallersymbol index starting PUSCH transmission) among the PUSCHs in the CCconfigured with UL-SCH indicator=0. Note that PUSCH to be used for theUCI transmission is not limited to the PUSCH for which transmissionstarts earliest in time, and may be another PUSCH.

Embodiment 3

In the present embodiment, descriptions will be given of a case where abase station requests A/SP-CSI to terminal 200 using a CSI request fieldwhen CA is applied to the terminal.

The base station and the terminal according to the present embodimenthave the same basic configurations as base station 100 and terminal 200according to Embodiment 1, and thus FIGS. 5 and 6 will be used for thedescription.

In NR, terminal 200 does not expect to receive two or more CSI requestsin a single slot. Thus, it is conceivable that the CSI request isconfigured to be non-zero in a certain CC and CSI request=0 isconfigured in the rest of the CCs when PUSCH is allocated for each of aplurality of CCs in CA and base station 100 requests CSI transmission onPUSCH.

However, the relationship between the configurations of the UL-SCHindicator field and the CSI request field among the plurality of CCs inthis case and the operation in terminal 200 is unclear.

This may cause the following problems as examples.

It is assumed that a PUSCH resource is allocated as illustrated in FIG.16. The PUSCH resource is configured with UL-SCH indicator=0 and CSIrequest=0 in CC index 0 (CC #0), and with UL-SCH indicator=1 and CSIrequest=1 in CC index 1 (CC #1), for example.

A simple method in this case is a method where terminal 200 transmitsA/SP-CSI required in CC #1 by multiplexing the A/SP-CSI on PUSCH in CC#1 as illustrated in FIG. 16.

In the case of FIG. 16, however, terminal 200 cannot use PUSCH in CC #0even though PUSCH is allocated in CC #0. In addition, a part of thePUSCH resource in CC #1 is used for the UCI transmission while terminal200 transmits UL-SCH using the PUSCH in CC #1, as illustrated in FIG.16. This causes a risk of deteriorating the received quality of theUL-SCH.

Herein, it is conceivable, for example, to configure UL-SCH indicator=0and CSI request=1 in CC #0, and UL-SCH indicator=1 and CSI request=0 inCC #1 as illustrated in FIG. 17, as a method of preventing thedeterioration of the received quality of UL-SCH described in FIG. 16. Inthe case of FIG. 17, terminal 200 can transmit UL-SCH using the PUSCHresource in CC #1 without UCI being multiplexed, and transmit A/SP-CSIusing the PUSCH resource in CC #0.

In NR, however, terminal 200 drops PUSCH transmitting A/SP-CSI withoutUL-SCH as illustrated in FIG. 18 when the PUSCH resource fortransmitting A/SP-CSI and a PUCCH resource for transmitting ACK/NACK orSR overlap in time with each other (see NPL 3, for example). Thus,terminal 200 cannot transmit A/SP-CSI in FIG. 18.

In addition, the ACK/NACK or SR is transmitted by being multiplexed onPUSCH in CC #1 as illustrated in FIG. 18. Thus, a part of the PUSCHresource is used for the transmission of the ACK/NACK or SR in FIG. 18,thereby causing a risk of deteriorating the received quality of UL-SCH.

In this regard, descriptions will be given of methods of appropriatelytransmitting A/SP-CSI (i.e., CSI requested by a CSI request) andACK/NACK or SR (i.e., UCI allocated for PUCCH) without deteriorating thereceived quality of UL-SCH, in the present embodiment.

For example, it is assumed that a PUSCH resource is allocated asillustrated in FIG. 19. The PUSCH resource is configured with UL-SCHindicator=0 and CSI request=0 in CC index 0 (CC #0), and with UL-SCHindicator=1 and CSI request=1 in CC index 1 (CC #1), as is the case withFIG. 16.

Terminal 200 transmits A/SP-CSI by multiplexing the A/SP-CSI on PUSCH inCC #0 configured with UL-SCH indicator=0 when the UL-SCH indicator fieldand the CSI request field are configured for each of the plurality ofCCs and the CSI request is requested as illustrated in FIG. 19.

Further, terminal 200 transmits ACK/NACK (or SR) by multiplexing theACK/NACK (or SR) on the PUSCH in CC #0 configured with UL-SCHindicator=0 when the PUSCH resource on which A/SP-CSI is multiplexedoverlaps (or partly overlaps) in time with a PUCCH resource fortransmitting ACK/NACK (or SR), as illustrated in FIG. 19. In otherwords, terminal 200 transmits the UCI using the PUSCH resource to beallocated by DCI configured with UL-SCH indicator=0 and CSI request=0,as in Embodiment 1.

Thus, in FIG. 19, terminal 200 multiplexes and transmits ACK/NACK (orSR) and A/SP-CSI using the PUSCH resource in CC #0, and transmits UL-SCHusing the PUSCH resource in CC #1.

As described above, the present embodiment enables to avoid themultiplex of UCI (e.g., ACK/NACK or A/SP-CSI) on PUSCH where terminal200 transmits UL-SCH, thereby preventing the deterioration of thereceived quality of the UL-SCH. The present embodiment also enables basestation 100 to dynamically allocate the PUSCH resource for transmittingUCI (the PUSCH resource in CC #0 in FIG. 19) following, for example, achange of a channel state, as is the case with Embodiment 1. Therefore,the received quality of the UCI in base station 100 and the uplinkresource utilization efficiency can be improved.

Note that the configurations of the UL-SCH indicator and the CSI requestin the present embodiment are not limited to the example in FIG. 19. Forexample, it is assumed that a PUSCH resource is allocated as illustratedin FIG. 20. The PUSCH resource is configured with UL-SCH indicator=0 andCSI request=1 in CC index 0 (CC #0), and with UL-SCH indicator=1 and CSIrequest=0 in CC index 1 (CC #1).

Terminal 200 may also transmit A/SP-CSI by multiplexing the A/SP-CSI onthe PUSCH in CC #0 configured with UL-SCH indicator=0 in the case ofFIG. 20. Further, terminal 200 transmits ACK/NACK (or SR) bymultiplexing the ACK/NACK (or SR) on the PUSCH in the CC configured withUL-SCH indicator=0 when the PUSCH resource on which A/SP-CSI ismultiplexed overlaps (or partly overlaps) in time with a resource forwhich PUCCH transmitting ACK/NACK (or SR) is allocated, as illustratedin FIG. 20. Thus, in FIG. 20, terminal 200 multiplexes and transmitsACK/NACK (or SR) and A/SP-CSI using the PUSCH resource in CC #0, andtransmits UL-SCH using the PUSCH resource in CC #1, as in FIG. 19.Therefore, the received quality of UCI in base station 100 and theuplink resource utilization efficiency can also be improved in the caseof FIG. 20.

When UL-SCH indicator=0 is configured for a plurality of CCs, terminal200 may multiplex UCI on PUSCH in CC with the smallest CC index amongthe plurality of CCs configured with UL-SCH indicator=0, for example.Note that CC for which the PUSCH resource to be used for the UCItransmission is allocated is not limited to the CC with the smallest CCindex, and may be another CC.

In addition, when UL-SCH indicator=1 is configured for all of theplurality of CCs, terminal 200 may multiplex UCI on PUSCH transmitted inCC with the smallest CC index as with the method described in NPL 3, forexample. Alternatively, terminal 200 may multiplex UCI on PUSCHtransmitted in CC where the CSI request is configured to be non-zero.Note that CC for which the PUSCH resource to be used for the UCItransmission is allocated is not limited to the CC with the smallest CCindex, and may be another CC.

Further, when a plurality of PUSCHs are allocated for a single CC and aPUCCH resource for transmitting UCI and the plurality of PUSCHs overlapin time with each other, terminal 200 may multiplex the UCI on PUSCH forwhich transmission starts earliest in time (i.e., PUSCH with a smallersymbol index starting PUSCH transmission) among the PUSCHs in the CCconfigured with UL-SCH indicator=0. Note that PUSCH to be used for theUCI transmission is not limited to the PUSCH for which transmissionstarts earliest in time, and may be another PUSCH.

Embodiment 4

In Embodiments 1 to 3 above, descriptions have been given of the casewhere UL-SCH indicator=0 and CSI request=0 are indicated in DCI as theindication of no UL-SCH transmission on PUSCH and no CSI report requestfrom a base station.

The indication of no UL-SCH transmission on PUSCH and no CSI reportrequest from a base station is not limited to the configuration of theDCI described above, however.

In the present embodiment, another indication method by the DCI for thecase of no UL-SCH transmission on PUSCH and no CSI report request from abase station will be described.

A base station and a terminal according to the present embodiment havethe same basic configurations as base station 100 and terminal 200according to Embodiment 1, and thus FIGS. 5 and 6 will be used for thedescription.

For example, a CSI request field included in DCI format 0-1 may indicate(i.e., trigger) monitoring of an aperiodic response signal for beamforming control (A-CSI; e.g., a response signal for CSI measurement)from the base station to the terminal. The CSI request field may alsoindicate (i.e., trigger) from the base station to the terminal that anaperiodic response signal for following a channel is monitored, forexample.

In this case, reportQuantity=none is indicated to the terminal byUE-specific higher layer signaling. The reportQuantity here as ahigher-layer parameter is indication information indicating informationto be actually transmitted when the terminal is requested to transmitCSI by the CSI request field.

Herein, the terminal determines that no UL-SCH transmission is on PUSCHand no CSI report request is made from the base station when UL-SCHindicator=0 and CSI request=non-zero are indicated in DCI, the CSIrequest=non-zero corresponds to the reportQuantity, andreportQuantity=none is configured by higher-layer signaling.

At this time, the terminal conceivably transmits UCI such as ACK/NACK todownlink data (e.g., PDSCH) not on PUSCH but on PUCCH when UL-SCHindicator=0 and CSI request=non-zero are indicated in the same timeresource as (or a time resource partly overlapping with) a slot (or amini-slot) for which PUCCH for transmitting the UCI (e.g., ACK/NACK) isallocated, and a PUSCH resource configured with reportQuantity=none isallocated, for example.

The allocation of a radio resource for PUCCH (a PUCCH resource),however, is operated semi-statically. The semi-static allocation of thePUCCH resource cannot follow a dynamic change of a channel state or arequirement, and thus the radio resource may not be used effectively.For example, when the channel state of the semi-statically allocatedPUCCH resource is deteriorated by the influence of channel fluctuationor inter-cell interference, the UCI transmission on PUCCH by theterminal may cause the received quality of the UCI to be deteriorated.The deterioration of the received quality of the UCI possibly causesinfluence on system optimization and causes deterioration of systemthroughput.

Thus, in the present embodiment, terminal 200 transmits UCI scheduled tobe transmitted in the PUCCH resource, using a PUSCH resource whenterminal 200 is allocated the PUSCH resource configured with UL-SCHindicator=0 and CSI request=non-zero, and also with reportQuantity=none,and the PUSCH resource and the PUCCH resource allocated for transmittingthe UCI overlap (or partly overlap) in time with each other.

A PUSCH resource is dynamically allocated while a PUCCH resource issemi-statically allocated as described above. Thus, base station 100 candynamically allocate the PUSCH resource for transmitting UCI following achange of a channel state between base station 100 and terminal 200, orthe like, as in Embodiment 1. This improves the received quality of theUCI in base station 100 and also improves the uplink resourceutilization efficiency.

Therefore, terminal 200 can appropriately transmit UCI according to thepresent embodiment. For example, the received quality of UCI in basestation 100 can be improved and the uplink resource utilizationefficiency can also be improved according to the present embodiment.

Note that the UCI in the present embodiment may include either one ofACK/NACK to downlink data and P/SP-CSI, or both of ACK/NACK to downlinkdata and P/SP-CSI.

Embodiment 5

A base station and a terminal according to the present embodiment havethe same basic configurations as base station 100 and terminal 200according to Embodiment 1, and thus FIGS. 5 and 6 will be used for thedescription.

In the present embodiment, in a case where UCI includes at leastP/SP-CSI, terminal 200 drops transmission of the P/SP-CSI when terminal200 is allocated the PUSCH resource configured with UL-SCH indicator=0and CSI request=non-zero, and also with reportQuantity=none, and thePUSCH resource and the PUCCH resource allocated for transmitting the UCIoverlap (or partly overlap) in time with each other.

In a case where UCI includes ACK/NACK to downlink data, in contrast,terminal 200 transmits the ACK/NACK to downlink data scheduled to betransmitted in a PUCCH resource using a PUSCH resource, similar to theoperation in Embodiment 4.

This enables to temporarily stop the P/SP-CSI transmission in terminal200 and improve the uplink resource utilization efficiency. Further,when UCI includes ACK/NACK and P/SP-CSI, dropping the P/SP-CSItransmission in terminal 200 increases the resource to be allocated forthe ACK/NACK, thereby improving the received quality of the ACK/NACK.

Embodiment 6

In the present embodiment, a case where CA is applied to a terminal willbe described.

A base station and a terminal according to the present embodiment havethe same basic configurations as base station 100 and terminal 200according to Embodiment 1, and thus FIGS. 5 and 6 will be used for thedescription.

Terminal 200 transmits UCI scheduled to be transmitted on PUCCH, using aPUSCH resource when a UL-SCH field and a CSI request field areconfigured for each of a plurality of CCs, no CSI report request is madefrom base station 100 in all the CCs, and the allocated PUSCH resourceand a PUCCH resource allocated for transmitting the UCI overlap (orpartly overlap) in time with each other, for example. The case where noCSI report request is made from base station 100 here includes, forexample, the case of CSI request=0 described in Embodiments 1 to 3, orthe case of CSI request=non-zero where the CSI request=non-zerocorresponds to reportQuantity, and reportQuantity=none is configured byhigher-layer signaling, described in Embodiment 4 or 5.

Herein, the UCI scheduled to be transmitted on PUCCH includes at leasteither one of ACK/NACK to downlink data and P-CSI/SP-CSI, for example.

Further, terminal 200 multiplexes UCI on PUSCH in CC configured withUL-SCH indicator=0 among a plurality of CCs configured for terminal 200.

As described above, the present embodiment enables to avoid themultiplex of UCI on PUSCH where terminal 200 transmits UL-SCH, therebypreventing the deterioration of the received quality of the UL-SCH. Thepresent embodiment also enables base station 100 to dynamically allocatethe PUSCH resource for transmitting UCI following, for example, a changeof a channel state, as is the case with Embodiment 1. Therefore, thereceived quality of the UCI in base station 100 and the uplink resourceutilization efficiency can be improved.

When UL-SCH indicator=0 is configured for a plurality of CCs, terminal200 may multiplex UCI on PUSCH in CC with the smallest CC index amongthe plurality of CCs configured with UL-SCH indicator=0, for example.Note that CC for which the PUSCH resource to be used for the UCItransmission is allocated is not limited to the CC with the smallest CCindex, and may be another CC. For example, when there are CCs configuredwith CSI request=0 and CSI request=non-zero respectively, terminal 200may multiplex UCI on PUSCH in the CC configured with CSI request=0.Alternatively, terminal 200 may multiplex UCI on PUSCH in the CCconfigured with CSI request=non-zero the other way around.

In addition, when UL-SCH indicator=1 is configured for all of theplurality of CCs, terminal 200 may multiplex UCI on PUSCH transmitted inCC with the smallest CC index as with the method described in NPL 3, forexample. Note that CC for which the PUSCH resource to be used for theUCI transmission is allocated is not limited to the CC with the smallestCC index, and may be another CC.

Further, when a plurality of PUSCHs are allocated for a single CC and aPUCCH resource for transmitting UCI and the plurality of PUSCHs overlapin time with each other, terminal 200 may multiplex the UCI on PUSCH forwhich transmission starts earliest in time (i.e., PUSCH with a smallersymbol index starting PUSCH transmission) among the PUSCHs in the CCconfigured with UL-SCH indicator=0. Note that PUSCH to be used for theUCI transmission is not limited to the PUSCH for which transmissionstarts earliest in time, and may be another PUSCH.

Each embodiment of the present disclosure has been described, thus far.

The embodiments described above enable terminal 200 to transmit UCI onPUSCH, originally scheduled to be transmitted on PUCCH, when UL-SCHindicator=0 and CSI request=0 are indicated in DCI. The embodimentsdescribed above also enable terminal 200 to transmit UCI on PUSCH,originally scheduled to be transmitted on PUCCH, when UL-SCHindicator=0, CSI request=non-zero, and reportQuantity=none areconfigured in DCI. The ambiguity of the relationship between the UL-SCHindicator field and the CSI request field can also be eliminated by notallowing base station 100 to configure UL-SCH indicator=0 and CSIrequest=0 in a specification, however. At this time, terminal 200 doesnot expect the indication of UL-SCH indicator=0 and CSI request=0 in DCIfor allocating PUSCH. Similarly, the specification need not allow basestation 100 to configure UL-SCH indicator=0 and CSI request=non-zero inDCI, when reportQuantity=none is configured. This case enables tosimplify the implementation of terminal 200.

Further, in the embodiments described above, descriptions have beengiven of the case of transmitting UCI using a PUSCH resource when aPUCCH resource for transmitting the UCI and the PUSCH resource allocatedby DCI configured with UL-SCH indicator=0 and CSI request=0 overlap intime with each other. In the present disclosure, however, terminal 200may also transmit UCI using the PUSCH resource when the PUCCH resourcefor transmitting the UCI and the PUSCH resource allocated by DCIconfigured with UL-SCH indicator=0 and CSI request=0 do not overlap intime with each other.

Further, the present disclosure can be realized by software, hardware,or software in cooperation with hardware. Each functional block used inthe description of each embodiment described above can be partly orentirely realized by an LSI such as an integrated circuit, and eachprocess described in the each embodiment may be controlled partly orentirely by the same LSI or a combination of LSIs. The LSI may beindividually formed as chips, or one chip may be formed so as to includea part or all of the functional blocks. The LSI may include a data inputand output coupled thereto. The LSI here may be referred to as an IC, asystem LSI, a super LSI, or an ultra LSI depending on a difference inthe degree of integration. However, the technique of implementing anintegrated circuit is not limited to the LSI and may be realized byusing a dedicated circuit, a general-purpose processor, or aspecial-purpose processor. In addition, a FPGA (Field Programmable GateArray) that can be programmed after the manufacture of the LSI or areconfigurable processor in which the connections and the settings ofcircuit cells disposed inside the LSI can be reconfigured may be used.The present disclosure can be realized as digital processing or analogueprocessing. If future integrated circuit technology replaces LSIs as aresult of the advancement of semiconductor technology or otherderivative technology, the functional blocks could be integrated usingthe future integrated circuit technology. Biotechnology can also beapplied.

The present disclosure can be realized by any kind of apparatus, deviceor system having a function of communication, which is referred to as acommunication apparatus. Some non-limiting examples of such acommunication apparatus include a phone (e.g, cellular (cell) phone,smart phone), a tablet, a personal computer (PC) (e.g, laptop, desktop,netbook), a camera (e.g, digital still/video camera), a digital player(digital audio/video player), a wearable device (e.g, wearable camera,smart watch, tracking device), a game console, a digital book reader, atelehealth/telemedicine (remote health and medicine) device, and avehicle providing communication functionality (e.g., automotive,airplane, ship), and various combinations thereof.

The communication apparatus is not limited to be portable or movable,and may also include any kind of apparatus, device or system beingnon-portable or stationary, such as a smart home device (e.g, anappliance, lighting, smart meter, control panel), a vending machine, andany other “things” in a network of an “Internet of Things (IoT)”.

The communication may include exchanging data through, for example, acellular system, a wireless LAN system, a satellite system, etc., andvarious combinations thereof.

The communication apparatus may comprise a device such as a controlleror a sensor which is coupled to a communication device performing afunction of communication described in the present disclosure. Forexample, the communication apparatus may comprise a controller or asensor that generates control signals or data signals which are used bya communication device performing a communication function of thecommunication apparatus.

The communication apparatus also may include an infrastructure facility,such as a base station, an access point, and any other apparatus, deviceor system that communicates with or controls apparatuses such as thosein the above non-limiting examples.”

A terminal according to the present disclosure includes: a receiver,which in operation, receives first control information related to anuplink data channel and second control information related to an uplinkcontrol channel for transmitting uplink control information, wherein thefirst control information includes first indication informationindicating presence or absence of transmission of uplink data and secondindication information indicating presence or absence of transmission ofchannel state information; and a transmitter, which in operation,transmits the uplink control information using a resource for the uplinkdata channel, when the first indication information indicates theabsence of the transmission of the uplink data and the second indicationinformation indicates the absence of the transmission of the channelstate information.

In the terminal according to an embodiment of the present disclosure,the resource for the uplink data channel is a resource overlapping intime with a resource for the uplink control channel.

In the terminal according to an embodiment of the present disclosure,the terminal is configured with a plurality of component carriers, andthe transmitter transmits the uplink control information using theresource for the uplink data channel when the first indicationinformation and the second indication information are configured foreach of the plurality of component carriers and the second indicationinformation indicates the absence of the transmission of the channelstate information in all of the plurality of component carriers.

In the terminal according to an embodiment of the present disclosure,the resource for the uplink data channel is a resource overlapping intime with a resource for the uplink control channel.

In the terminal according to an embodiment of the present disclosure,the resource for the uplink data channel is a resource in one or more ofthe plurality of component carriers where the first indicationinformation indicates the absence of the transmission of the uplinkdata.

In the terminal according to an embodiment of the present disclosure,the resource for the uplink data channel is a resource in at least oneof the plurality of component carriers with a smallest component carriernumber among the one or more of the plurality of component carrierswhere the first indication information indicates the absence of thetransmission of the uplink data.

In the terminal according to an embodiment of the present disclosure,the resource for the uplink data channel is a resource for an uplinkdata channel for which transmission starts earliest in time, among aplurality of the uplink data channels in the one or more of theplurality of component carriers where the first indication informationindicates the absence of the transmission of the uplink data.

In the terminal according to an embodiment of the present disclosure,the terminal is configured with a plurality of component carriers, andthe transmitter multiplexes and transmits the uplink control informationand the channel state information using the resource for the uplink datachannel in one or more of the plurality of component carriers where thefirst indication information indicates the absence of the transmissionof the uplink data, when the first indication information and the secondindication information are configured in each of the plurality ofcomponent carriers and the second indication information in at least oneof the plurality of component carriers indicates the presence of thetransmission of the channel state information.

In the terminal according to an embodiment of the present disclosure,the resource for the uplink data channel is a resource in one or more ofthe plurality of component carriers where the second indicationinformation indicates the absence of the transmission of the channelstate information.

In the terminal according to an embodiment of the present disclosure,the resource for the uplink data channel is a resource in at least oneof the plurality of component carriers with a smallest component carriernumber among the one or more of the plurality of component carrierswhere the first indication information indicates the absence of thetransmission of the uplink data.

In the terminal according to an embodiment of the present disclosure,the resource for the uplink data channel is a resource for an uplinkdata channel for which transmission starts earliest in time, among aplurality of the uplink data channels in the one or more of theplurality of component carriers where the first indication informationindicates the absence of the transmission of the uplink data.

In the terminal according to an embodiment of the present disclosure,the uplink control information includes at least one of a responsesignal to downlink data and the channel state information.

A base station according to the present disclosure includes: atransmitter, which in operation, transmits first control informationrelated to an uplink data channel and second control information relatedto an uplink control channel for transmitting uplink controlinformation, wherein the first control information includes firstindication information indicating presence or absence of transmission ofuplink data and second indication information indicating presence orabsence of transmission of channel state information; and a receiver,which in operation, receives the uplink control information to betransmitted using a resource for the uplink data channel, when the firstindication information indicates the absence of the transmission of theuplink data and the second indication information indicates the absenceof the transmission of the channel state information.

A communication method according to the present disclosure includes:receiving first control information related to an uplink data channeland second control information related to an uplink control channel fortransmitting uplink control information, wherein the first controlinformation includes first indication information indicating presence orabsence of transmission of uplink data and second indication informationindicating presence or absence of transmission of channel stateinformation; and transmitting the uplink control information using aresource for the uplink data channel, when the first indicationinformation indicates the absence of the transmission of the uplink dataand the second indication information indicates the absence of thetransmission of the channel state information.

A communication method according to the present disclosure includes:transmitting first control information related to an uplink data channeland second control information related to an uplink control channel fortransmitting uplink control information, wherein the first controlinformation includes first indication information indicating presence orabsence of transmission of uplink data and second indication informationindicating presence or absence of transmission of channel stateinformation; and receiving the uplink control information to betransmitted using a resource for the uplink data channel, when the firstindication information indicates the absence of the transmission of theuplink data and the second indication information indicates the absenceof the transmission of the channel state information.

The disclosures of Japanese Patent Applications No. 2018-139337 and No.2018-202046, filed on Jul. 25, 2018, and Oct. 26, 2018, respectively,including the specifications, drawings, and abstracts are incorporatedherein by reference in their entirety.

INDUSTRIAL APPLICABILITY

One exemplary embodiment of the present disclosure is useful in mobilecommunication systems.

REFERENCE SIGNS LIST

-   100 Base station-   101, 211 Controller-   102 Data generator-   103, 107, 110, 212, 214, 216 Encoder-   104 Retransmission controller-   105, 108, 111, 213, 215, 217 Modulator-   106 Higher-layer control signal generator-   109 Downlink control signal generator-   112, 218 Signal assigner-   113, 219 Inverse Fast Fourier Transformer (IFFT)-   114, 220 Transmitter-   115, 201 Antenna-   116, 202 Receiver-   117, 203 Fast Fourier Transformer (FFT)-   118, 204 Extractor-   119 ACK/NACK Demodulator-   120, 123, 126 Decoder-   121, 124, 127 Determiner-   122 CSI Demodulator-   125 UL-SCH Demodulator-   200 Terminal-   205 Downlink control signal demodulator-   206, 208, 210 Decoder-   207 Higher-layer control signal demodulator-   209 Data demodulator

1-15. (canceled)
 16. A terminal, comprising: a receiver, which, inoperation, receives downlink control information (DCI) including uplinkshared channel (UL-SCH) indicator information and channel stateinformation (CSI) request information; and a transmitter, which, inoperation, transmits acknowledge (ACK) information of uplink controlinformation (UCI).
 17. The terminal according to claim 16, wherein thereceiver is not expected to receive the DCI, which includes the UL-SCHindicator information indicating that UL-SCH is not transmitted on aphysical uplink shared channel (PUSCH) and the CSI request informationindicating that CSI is not requested.
 18. The terminal according toclaim 17, wherein the DCI does not use DCI format 0_1.
 19. The terminalaccording to claim 16, wherein the receiver is expected to receive theDCI, which includes the UL-SCH indicator information indicating thatUL-SCH is not transmitted on a physical uplink shared channel (PUSCH)and the CSI request information indicating that CSI is requested. 20.The terminal according to claim 16, wherein the terminal multiplexes theACK information in the PUSCH responsive to: that a physical uplinkcontrol channel (PUCCH) transmission allocated for a transmission of theUCI overlaps a physical uplink shared channel (PUSCH) transmission; andthat an aperiodic CSI report or a semi-persistent CSI report ismultiplexed in the PUSCH.
 21. The terminal according to claim 16,wherein the terminal sets a resource based on an indication: that theUL-SCH indicator information indicates that UL-SCH is not transmitted ona physical uplink shared channel (PUSCH); and that the CSI requestinformation indicates that CSI is not requested, and the transmittertransmits the ACK information of the UCI using the resource.
 22. Theterminal according to claim 21, wherein the resource is the PUSCH. 23.The terminal according to claim 16, wherein the terminal sets a timingof transmission of the ACK information based on an indication: that theUL-SCH indicator information indicates that UL-SCH is not transmitted ona physical uplink shared channel (PUSCH); and that the CSI requestinformation indicates that CSI is not requested, and the transmittertransmits the ACK information of the UCI based on the timing.
 24. Acommunication method comprising: receiving downlink control information(DCI) including uplink shared channel (UL-SCH) indicator information andchannel state information (CSI) request information; and transmittingacknowledge (ACK) information of uplink control information (UCI). 25.The communication method according to claim 24, wherein the DCI is notrequested, which includes the UL-SCH indicator information indicatingthat UL-SCH is not transmitted on a physical uplink shared channel(PUSCH) and the CSI request information indicating that CSI is notrequested.
 26. The communication method according to claim 25, whereinthe DCI does not use DCI format 0_1.
 27. The communication methodaccording to claim 24, wherein the DCI is expected, which includes theUL-SCH indicator information indicating that UL-SCH is not transmittedon a physical uplink shared channel (PUSCH) and the CSI requestinformation indicating that CSI is requested.
 28. The communicationmethod according to claim 24, comprising, multiplexing the ACKinformation in the PUSCH responsive to: that a physical uplink controlchannel (PUCCH) transmission allocated for a transmission of the UCIoverlaps a physical uplink shared channel (PUSCH) transmission; and thatan aperiodic CSI report or a semi-persistent CSI report is multiplexedin the PUSCH.
 29. The communication method according to claim 24,comprising: setting a resource based on an indication: that the UL-SCHindicator information indicates that UL-SCH is not transmitted on aphysical uplink shared channel (PUSCH); and that the CSI requestinformation indicates that CSI is not requested, and transmitting theACK information of the UCI using the resource.
 30. The communicationmethod according to claim 29, wherein the resource is the PUSCH.
 31. Thecommunication method according to claim 24, comprising: setting a timingof transmission of the ACK information based on an indication: that theUL-SCH indicator information indicates that UL-SCH is not transmitted ona physical uplink shared channel (PUSCH); and that the CSI requestinformation indicates that CSI is not requested; and transmitting theACK information of the UCI based on the timing.